GM Service Manual Online
For 1990-2009 cars only

Your vehicle may have the entry lighting feature. Your courtesy lamps will come on and stay on for a set time whenever you press UNLOCK on the remote keyless entry transmitter, if equipped.

If you open a door, the lamps will stay on while it's open and then turn off automatically about 25 seconds after you close it. If you press UNLOCK and don't open a door, the lamps will turn off after about 40 seconds.

Illuminated entry includes a feature called theater dimming. With theater dimming, the lamps don't just turn off at the end of the delay time. Instead, they slowly dim after the delay time until they go out. The delay time is canceled if you turn the ignition key to RUN or press the power door lock switch.

When the ignition is on, illuminated entry is inactive, which means the courtesy lamps won't come on unless a door is opened.